The invention relates to a dosimeter comprising a quantity of dosimetric material, the dosimeter being suitable for being irradiated and undergoing a dose measurement by EPR spectroscopy, the enclosure being made from a material not having a response in EPR spectroscopy or having a response different from the response of the dosimetric material after identical irradiation such that the signal of the material of the enclosure decreases as a function of time after irradiation of said material such that a period of time exists after irradiation at the end of which the material has no measurable signal, or a residual signal whose intensity is less than 5% of that measured after irradiation, and the dosimetric material has a constant EPR signal alter irradiation. The invention also relates to a method for measuring the dose absorbed by the dosimetric material contained in such a dosimeter.